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124.\" ========================================================================
125.\"
126.IX Title "BIO_f_cipher 3"
127.TH BIO_f_cipher 3 "2010-11-16" "0.9.8p" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
132.SH "NAME"
133BIO_f_cipher, BIO_set_cipher, BIO_get_cipher_status, BIO_get_cipher_ctx \- cipher BIO filter
134.SH "SYNOPSIS"
135.IX Header "SYNOPSIS"
136.Vb 2
137\& #include <openssl/bio.h>
138\& #include <openssl/evp.h>
139\&
140\& BIO_METHOD * BIO_f_cipher(void);
141\& void BIO_set_cipher(BIO *b,const EVP_CIPHER *cipher,
142\& unsigned char *key, unsigned char *iv, int enc);
143\& int BIO_get_cipher_status(BIO *b)
144\& int BIO_get_cipher_ctx(BIO *b, EVP_CIPHER_CTX **pctx)
145.Ve
146.SH "DESCRIPTION"
147.IX Header "DESCRIPTION"
148\&\fIBIO_f_cipher()\fR returns the cipher \s-1BIO\s0 method. This is a filter
149\&\s-1BIO\s0 that encrypts any data written through it, and decrypts any data
150read from it. It is a \s-1BIO\s0 wrapper for the cipher routines
151\&\fIEVP_CipherInit()\fR, \fIEVP_CipherUpdate()\fR and \fIEVP_CipherFinal()\fR.
152.PP
153Cipher BIOs do not support \fIBIO_gets()\fR or \fIBIO_puts()\fR.
154.PP
155\&\fIBIO_flush()\fR on an encryption \s-1BIO\s0 that is being written through is
156used to signal that no more data is to be encrypted: this is used
157to flush and possibly pad the final block through the \s-1BIO\s0.
158.PP
159\&\fIBIO_set_cipher()\fR sets the cipher of \s-1BIO\s0 \fBb\fR to \fBcipher\fR using key \fBkey\fR
160and \s-1IV\s0 \fBiv\fR. \fBenc\fR should be set to 1 for encryption and zero for
161decryption.
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18.\" Set up some character translations and predefined strings. \*(-- will
19.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
20.\" double quote, and \*(R" will give a right double quote. \*(C+ will
21.\" give a nicer C++. Capital omega is used to do unbreakable dashes and
22.\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
23.\" nothing in troff, for use with C<>.
24.tr \(*W-
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44.ie \n(.g .ds Aq \(aq
45.el .ds Aq '
46.\"
47.\" If the F register is turned on, we'll generate index entries on stderr for
48.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
49.\" entries marked with X<> in POD. Of course, you'll have to process the
50.\" output yourself in some meaningful fashion.
51.ie \nF \{\
52. de IX
53. tm Index:\\$1\t\\n%\t"\\$2"
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55. nr % 0
56. rr F
57.\}
58.el \{\
59. de IX
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61.\}
62.\"
63.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
64.\" Fear. Run. Save yourself. No user-serviceable parts.
65. \" fudge factors for nroff and troff
66.if n \{\
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123.rm #[ #] #H #V #F C
124.\" ========================================================================
125.\"
126.IX Title "BIO_f_cipher 3"
127.TH BIO_f_cipher 3 "2010-11-16" "0.9.8p" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
132.SH "NAME"
133BIO_f_cipher, BIO_set_cipher, BIO_get_cipher_status, BIO_get_cipher_ctx \- cipher BIO filter
134.SH "SYNOPSIS"
135.IX Header "SYNOPSIS"
136.Vb 2
137\& #include <openssl/bio.h>
138\& #include <openssl/evp.h>
139\&
140\& BIO_METHOD * BIO_f_cipher(void);
141\& void BIO_set_cipher(BIO *b,const EVP_CIPHER *cipher,
142\& unsigned char *key, unsigned char *iv, int enc);
143\& int BIO_get_cipher_status(BIO *b)
144\& int BIO_get_cipher_ctx(BIO *b, EVP_CIPHER_CTX **pctx)
145.Ve
146.SH "DESCRIPTION"
147.IX Header "DESCRIPTION"
148\&\fIBIO_f_cipher()\fR returns the cipher \s-1BIO\s0 method. This is a filter
149\&\s-1BIO\s0 that encrypts any data written through it, and decrypts any data
150read from it. It is a \s-1BIO\s0 wrapper for the cipher routines
151\&\fIEVP_CipherInit()\fR, \fIEVP_CipherUpdate()\fR and \fIEVP_CipherFinal()\fR.
152.PP
153Cipher BIOs do not support \fIBIO_gets()\fR or \fIBIO_puts()\fR.
154.PP
155\&\fIBIO_flush()\fR on an encryption \s-1BIO\s0 that is being written through is
156used to signal that no more data is to be encrypted: this is used
157to flush and possibly pad the final block through the \s-1BIO\s0.
158.PP
159\&\fIBIO_set_cipher()\fR sets the cipher of \s-1BIO\s0 \fBb\fR to \fBcipher\fR using key \fBkey\fR
160and \s-1IV\s0 \fBiv\fR. \fBenc\fR should be set to 1 for encryption and zero for
161decryption.
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